Re: Poll: What is it?
I think it depends on the way you build them. If you just slap a China kit on a bicycle, it's bicycle with a motor.
If you work on the motor a bit, adjust things properly, have lights, mirrors, speedo, front suspension etc it's a moped, and if you have all of the above plus gears (like a SBP kit or a Lifan) than it's a homebuilt motorcycle.
My build will be the last when it's done, and the only relation to a bicycle will be frame and pedals (latter to keep it legal-ish without insurance and reg).
Motorcycles, Motor-bicycles and bicycles- two wheels and the open air is all I need.